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Finding the Fourth Proportional to 40,578.76, 60,860.85 and 18,388

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Solution

The fourth proportional to 40,578.76, 60,860.85 and 18,388 is: 27,578.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,578.76 : 60,860.85 = 18,388 : x
  2. Step 2: Convert to fraction form
    40,578.76/60,860.85 = 18,388/x
  3. Step 3: Cross multiply
    40,578.76x = 60,860.85 × 18,388
  4. Step 4: Simplify right side
    40,578.76x = 1,119,109,309.80
  5. Step 5: Solve for x
    x = 1,119,109,309.80/40,578.76
  6. Step 6: Final answer
    x = 27,578.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.